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Page 1 of 69

Dec 01/14570-5012 Rev. K

Initial Issue JAN 08/2001

ARTEX PRODUCTS / ACR ELECTRONICS, INC.5757 Ravenswood Rd, Ft. Lauderdale, FL 33312

Cage Code: 18560

25-62-21

G406-4EMERGENCY LOCATOR TRANSMITTER

Description, Operation, Installation and Maintenance Manual

This manual includes data for the equipment that follows:

Component Part No. Model No.Emergency Locator Transmitter 453-5012 G406-4

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ARTEX PRODUCTS / ACR ELECTRONICS, INCDESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL

G406-4 (453-5012)

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PROPRIETARY INFORMATION

This document contains proprietary information and such information may not be disclosed to others for any

purpose, nor used for manufacturing purposes without written permission from ACR Electronics.

Information in this manual is subject to change without notice. ACR Electronics makes no warranty, expressed

or implied, with regard to this manual, including but not limited to any implied warranties of merchantability,fitness for a particular purpose, and non-infringement. In addition, ACR Electronics makes no warranty with

regard to the documentation or data contained herein. ACR Electronics is not liable in the event of incidentals,special, consequential, or any other damages in connection with or arising from furnishing, performance, or useof this manual.

Reproduction of this publication or any portion thereof by any means is prohibited. For further informationcontact Sales, ACR Electronics, 5757 Ravenswood Rd, Fort Lauderdale, FL 33312. Telephone (954) 981-3333.

AIRWORTHINESS LIMITATIONS

The Airworthiness limitations section is FAA approved and specifies inspections and other maintenance required

under 14 CFR§ 43.16 and 91.403, unless an alternative program has been approved.

IMPORTANT NOTICE

ACR Electronics will be responsible for full distribution and revisions of ICA’s (Instructions for Continued Airworthiness). For inquiries regarding the content and currency of this manual, contact ACR Electronics, 5757

Ravenswood Rd, Fort Lauderdale, FL 33312. Telephone (954) 981-3333.

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RECORD OF REVISIONS

REVISION CHANGE DATE REVISION CHANGE DATE

- RELEASE Jan 14/2000

A DCN 1589 Feb 12/2001

A DCN 1604 Mar 13/2001

B DCN 1641 Apr 11/2001

C DCN 1712 Jun 04/2001

C DCN 1965 Apr 04/2002

C DCN 2115 Dec 10/2002

D DCN 2408 May 26/2005

D DCN 2675 Dec 01/2005

D DCN 2891 Nov 30/2006

E DCN 2968 Mar 20/2007

F DCA W9414 Apr 06/2010

G ECO 14756 Jul 28/2011

H ECO 15149 Jul 31/2012

J ECO 15726 Aug 13/2014

K ECO 15830 Dec 01/2014

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SERVICE BULLETIN LIST

SERVICEBULLETIN NO

ISSUEDATE

SUBJECTMANUALREV NO

MANUALREV DATE

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LIST OF EFFECTIVE PAGES

SUBJECT PAGE DATE SUBJECT PAGE DATE

Title Page 1 Aug 13/14 Test and Fault Isolation (cont.) 27 Aug 13/14

Notices 2 Aug 13/14 28 Aug 13/14

Record of Revisions 3 Dec 01/14 29 Aug 13/14

Service Bulletin List 4 Aug 13/14 30 Aug 13/14

List of Effective Pages 5 Aug 13/14 31 Aug 13/14

6 Aug 13/14 32 Aug 13/14

Table of Contents 7 Aug 13/14 33 Aug 13/14

8 Dec 01/14 34 Aug 13/14

9 Dec 01/14 35 Aug 13/14

List of Figures 10 Aug 13/14 36 Aug 13/14

Introduction 11 Aug 13/14 37 Aug 13/14

12 Aug 13/14 38 Aug 13/14

13 Aug 13/14 Removal 39 Aug 13/14

14 Aug 13/14 40 Aug 13/14

15 Aug 13/14 41 Aug 13/14

16 Aug 13/14 Installation 42 Dec 01/14

17 Aug 13/14 43 Dec 01/14

Description and Operation 18 Aug 13/14 44 Dec 01/14

19 Aug 13/14 45 Aug 13/14

20 Aug 13/14 46 Aug 13/14

21 Aug 13/14 47 Aug 13/14

22 Aug 13/14 48 Aug 13/14

23 Aug 13/14 49 Aug 13/14

24 Aug 13/14 50 Aug 13/14

25 Aug 13/14 51 Aug 13/14

Test and Fault Isolation 26 Aug 13/14 52 Aug 13/14

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SUBJECT PAGE DATE SUBJECT PAGE DATE

Installation (cont.) 53 Aug 13/14 Appendix A 61 Aug 13/14

54 Aug 13/14 62 Aug 13/14

55 Aug 13/14 Illustrated Parts List 63 Aug 13/14

56 Aug 13/14 64 Aug 13/14

57 Aug 13/14 65 Aug 13/14

58 Aug 13/14 66 Aug 13/14

59 Aug 13/14 67 Aug 13/14

60 Aug 13/14 68 Aug 13/14

69 Dec 01/14

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TABLE OF CONTENTS

RECORD OF REVISIONS ............................................................................................................................ 3

SERVICE BULLETIN LIST ........................................................................................................................... 4

LIST OF EFFECTIVE PAGES........................................................................................................................ 5

TABLE OF CONTENTS ............................................................................................................................... 7

LIST OF FIGURES ................................................................................................................................... 10

INTRODUCTION ..................................................................................................................................... 11

1. Manual Usage .............................................................................................................................. 11 A. General ............................................................................................................................... 11 B. Application .......................................................................................................................... 11

2. Model Description ........................................................................................................................ 12 A. G406-4 ................................................................................................................................ 12

3.

Approvals .................................................................................................................................... 12

A. G406-4 ................................................................................................................................ 12 B. Battery ................................................................................................................................ 12

C. RTCA DO-160D Compliance .................................................................................................. 13

4. Frequency Allocations ................................................................................................................... 14

A. Application .......................................................................................................................... 14 B. Discussion ........................................................................................................................... 14

5. List of Acronyms, Abbreviations, and Definitions ............................................................................ 15

6. References .................................................................................................................................. 17 A. Regulatory Documents ......................................................................................................... 17

B. Other Documents ................................................................................................................. 17

DESCRIPTION AND OPERATION .............................................................................................................. 18

1. Description .................................................................................................................................. 18 A. Functional Overview ............................................................................................................. 18

B. Components ........................................................................................................................ 19

2. Operation .................................................................................................................................... 21 A. Operational Overview ........................................................................................................... 21

B. Normal Operation ................................................................................................................ 22 C. Manual Activation ................................................................................................................. 22

D. ELT Reset ............................................................................................................................ 22 E. Functional Check .................................................................................................................. 22

3. Specifications ............................................................................................................................... 23

A.

Environmental and Physical .................................................................................................. 23 B. Electrical ............................................................................................................................. 24

C. Antennas ............................................................................................................................. 25

TEST AND FAULT ISOLATION .................................................................................................................. 26

1. Inspection and Test Regulatory Requirements ............................................................................... 26 A. United States ....................................................................................................................... 26 B. Canada ................................................................................................................................ 26

C. Other Countries ................................................................................................................... 26

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2. Inspection and Test Procedures .................................................................................................... 27

A. Checklist .............................................................................................................................. 27 B. Preparation .......................................................................................................................... 28

C. Coax Cables and Wiring Connections Inspection – Item 1 ....................................................... 28 D. Mounting Tray and Hardware Inspection – Item 2 ................................................................. 28 E. Battery Pack Inspection – Item 3 .......................................................................................... 28

F.

G-Switch Functional Check – Item 4 ...................................................................................... 29

G. Performance Testing Setup ................................................................................................... 30

H. 121.5 MHz Frequency Measurement – Item 5a ...................................................................... 30 I. Audio Modulation Check – Item 5b ........................................................................................ 30 J. 121.5/243.0 MHz Power Output Measurement – Item 5c ........................................................ 31 K. 406 MHz Frequency Measurement – Item 5d ......................................................................... 31

L. 406 MHz Power Output Measurement – Item 5e .................................................................... 31 M. Current Draw Test – Item 5f ................................................................................................. 32 N. Digital Message Verification – Item 5g ................................................................................... 33 O. ELT Reset Check – Item 5h .................................................................................................. 33 P. Installed Transmitter Test – Item 6 ....................................................................................... 34

Q. Antenna Test – Item 7 ......................................................................................................... 35 R. Inspection and Test Documentation – Item 8 ........................................................................ 35

3. Fault Isolation .............................................................................................................................. 36

A. Self-Test Error Troubleshooting Guidelines ............................................................................ 36 B. ELT Troubleshooting Guidelines ............................................................................................ 38

REMOVAL ............................................................................................................................................... 39

1. ELT ............................................................................................................................................. 39

A. ELT Removal ....................................................................................................................... 39

2. Battery ........................................................................................................................................ 40 A. Battery Pack Removal .......................................................................................................... 40

3. Material or Equipment Return ....................................................................................................... 41 A. Shipment Information .......................................................................................................... 41

B.

Return Material Authorization................................................................................................ 41

INSTALLATION ....................................................................................................................................... 42

1. Regulatory Requirements and Guidelines ....................................................................................... 42

A. TSO C126, Paragraph D ....................................................................................................... 42 B. FAA ..................................................................................................................................... 42 C. Canada ................................................................................................................................ 43 D. Other Countries ................................................................................................................... 43 E. RTCA................................................................................................................................... 43

2. Mounting Tray ............................................................................................................................. 44 A. Location .............................................................................................................................. 44 B. Installation .......................................................................................................................... 46

3.

Antenna ...................................................................................................................................... 47 A. Selection ............................................................................................................................. 47

B. Location .............................................................................................................................. 47 C. Installation .......................................................................................................................... 47

4. Remote Switch ............................................................................................................................. 49 A. Location .............................................................................................................................. 49 B. Installation .......................................................................................................................... 49

5. Buzzer ......................................................................................................................................... 50

A. Location .............................................................................................................................. 50

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B. Installation .......................................................................................................................... 50

6. Wiring ......................................................................................................................................... 51 A. General Considerations and Recommendations ...................................................................... 51

B. Remote Switch Harness Fabrication ....................................................................................... 52 C. ELT 12-Pin Receptacle Installation ........................................................................................ 54

D. Cockpit Remote Switch 9-Pin Plug Installation ........................................................................ 55 E.

Wiring Installation ................................................................................................................ 55

F. Antenna Connections ........................................................................................................... 55

G. Cockpit Remote Switch Power Connection ............................................................................. 55 H. Remote Switch Alternate Power Source ................................................................................. 55 I. Airframe Ground Connections ............................................................................................... 56 J. Buzzer Connections .............................................................................................................. 56 K. Remote Switch Final Installation ........................................................................................... 56

7. ELT Installation ............................................................................................................................ 56 A. Installation and Test ............................................................................................................ 56 B. Harness ELT Receptacle Sealing ............................................................................................ 57 C. Installation Documentation ................................................................................................... 58

8. Battery Pack Installation ............................................................................................................... 58

A.

Battery Reinstallation ........................................................................................................... 58

B. New Battery Installation ....................................................................................................... 60

APPENDIX A – ELT REGISTRATION .......................................................................................................... 61

1. Background Information ............................................................................................................... 61

A. Hex ID Code ........................................................................................................................ 61 B. Reason for Registration ........................................................................................................ 61 C. Registration Information Resources ....................................................................................... 61

2. Registration ................................................................................................................................. 62 A. Responsibility ....................................................................................................................... 62 B. Required Information ........................................................................................................... 62 C. Where to Register ................................................................................................................ 62

ILLUSTRATED PARTS LIST ...................................................................................................................... 63

1. Introduction................................................................................................................................. 63 A. Purpose ............................................................................................................................... 63

B. IPL Usage Guide .................................................................................................................. 63

2. Manufacturer Name and Address .................................................................................................. 63

A. Ordering Information ........................................................................................................... 63

3. Explanation of Detailed Parts List Entries ....................................................................................... 64 A. Fig # & Item Column ........................................................................................................... 64

B. Part # Column ..................................................................................................................... 64 C. Nomenclature Column .......................................................................................................... 64

D. UPA (Units Per Assembly) Column ......................................................................................... 65

4.

Detailed Parts List ........................................................................................................................ 66

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LIST OF FIGURES

Figure 1 G406-4 ELT and Mounting Frame Assembly .......................................................................... 19

Figure 2 Remote Switch Front View ................................................................................................... 19

Figure 3 Buzzer ................................................................................................................................ 20

Figure 4 Battery Pack Assembly ........................................................................................................ 20

Figure 5 Antennas ............................................................................................................................ 20

Figure 6 ELT Operational Flow Diagram ............................................................................................. 21

Figure 7 Performance Testing Equipment Setup ................................................................................. 30

Figure 8 Current Draw Test Setup ..................................................................................................... 32

Figure 9 Short and Long 406 MHz Message Examples ........................................................................ 33

Figure 10 ELT Removal Sequence ..................................................................................................... 39

Figure 11 Battery Pack Removal ........................................................................................................ 40

Figure 12 G406-4 ELT Outline and Dimensions................................................................................... 45

Figure 13 Typical Mounting Tray Installation ...................................................................................... 46

Figure 14 Whip Antennas 110-324 and 110-329 Outlines and Dimensions ........................................... 48

Figure 15 Rod Antenna 110-320 Outline and Dimensions .................................................................... 48

Figure 16 Remote Switch Outline and Dimensions .............................................................................. 49

Figure 17 Buzzer Outline and Dimensions .......................................................................................... 50

Figure 18 Remote Switch Harness Arrangement ................................................................................. 52

Figure 19 Remote Switch Harness Wiring Diagram ............................................................................. 53

Figure 20 Remote Harness Wiring at ELT End .................................................................................... 54

Figure 21 ELT Installation Sequence .................................................................................................. 57

Figure 22 Battery Pack Installation .................................................................................................... 58

Figure 23 Battery Pack Retaining Screw Tightening Pattern ................................................................ 59

Figure 24 G406-4 ELT Main Assembly and Installation ........................................................................ 66

Figure 25 Electrical Components ....................................................................................................... 68

Figure 26 Antennas .......................................................................................................................... 69

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INTRODUCTION

TASK 25-62-21-990-801

1. Manual Usage

SUBTASK 25-62-21-990-001

A. General

1) This manual describes the operation, installation, and maintenance of the Model G406-4 emergency locatortransmitter (ELT). This information is provided to ensure initial and continued airworthiness. Informationpresented in this manual is accurate at time of printing, but is subject to change. Refer to the Artex productsweb site at www.acrelectronics.com for the latest information and any updates to this manual.

2) Information on COSPAS-SARSAT emergency locator beacon registration requirements and procedures isprovided in Appendix A – ELT Registration on page 61.

3) Web links provided in this manual were accurate at time of printing but may be subject to change.

4) ACR Electronics reserves the right to add approved components to the ELT system; including, but not limitedto antennas, remote switches, and coaxial cables.

5) Regulatory references contained herein are generally confined to United States and Canadian requirementsand, in any case, should not be considered all encompassing. Consult your national aviation authority forapplicable requirements.

SUBTASK 25-62-21-990-002

B. Application

1) This manual constitutes supporting data/documentation for the G406-4 ELT, including:

a) Description and Operation

b) Test and Fault Isolation (includes inspection criteria)

c) Removal

d)

Installatione) Registration

f) Illustrated Parts List

2) In the United States, the G406-4 ELT must be installed and maintained in accordance with therequirements herein and 14 CFR, FAR Parts 43, and 91; and other airworthiness requirements, asapplicable.

3) In Canada, the G406-4 ELT must be installed and maintained in accordance with the requirementsherein and Canadian Aviation Regulations (CAR), Part V, Paragraph 551.104 and other CARairworthiness requirements, as applicable.

4) G406-4 ELT installation and maintenance in all other countries must comply with the requirementsherein and applicable national airworthiness requirements.

5)

The accessories (i.e., remote switch and antennas) addressed in this manual are the accessories mostcommonly associated with the G406-4 ELT. Other options, such as a different remote switchconfiguration or an ELT/NAV Interface, should be installed and maintained in accordance with thewritten instructions specific to the accessory.

NOTE: Contact ACR Electronics for optional accessories approved for use with the G406-4 ELT.

6) To ensure proper operation, only parts listed in the Illustrated Parts List of this manual or thoserecommended by ACR Electronics may be used as replacement parts for the G406-4 ELT.

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TASK 25-62-21-990-802

2. Model Description

SUBTASK 25-62-21-990-001

A.

G406-41) The G406-4 is a type AF (Automatic Fixed) ELT, which transmits on 121.5, 243.0, and 406 MHz.

2) The ELT is enclosed within a multi-piece mounting frame consisting of a mounting tray, protective topcover and mounting frame cap.

3) When ordered as a system, an installation kit, cockpit remote switch, coax cables, audible buzzer, anddual input antenna are provided.

NOTE: The G406-4 ELT may be ordered with separate 121.5/243.0 MHz and 406 MHzantennas, rather than a single, dual input antenna.

TASK 25-62-21-990-803

3. Approvals

SUBTASK 25-62-21-990-001

A. G406-4

1) FAA TSO C126, Type AF

a) The conditions and tests required for TSO approval of this article are minimum performancestandards. It is the responsibility of those installing this article either on or within a specific type orclass of aircraft to determine that the aircraft installation conditions are within TSO standards. TSOarticles must have separate approval for installation in an aircraft. The article may be installed onlyif performed under 14 CFR Part 43 or the applicable airworthiness requirements.

2) Transport Canada - Type Certificate Data Sheet AP-47, Issue 2

3) Industry Canada Certification Number 1215873110AF

4)

JTSO-2C126

5) COSPAS-SARSAT - Certificate No. 112 or 170

SUBTASK 25-62-21-990-002

B. Battery

CAUTION: LITHIUM BATTERY SAFETY CONCERNS INCLUDE THE POSSIBILITY OF FIRE, VENTING VIOLENTLY, AND VENTING OF TOXIC GASES.

1) The lithium battery pack used on the G406-4 ELT is certified under TSO C142.

a) The conditions and tests required for TSO approval of this battery are minimum performancestandards. It is the responsibility of those desiring to install this battery in a specific type or class ofaircraft to determine that the aircraft installation conditions are within the TSO standards. The

battery may be installed only if further evaluation by applicant documents an acceptable installationand is approved by the Administrator.

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SUBTASK 25-62-21-990-003

C. RTCA DO-160D Compliance

1) DO-160D Environmental Categories: C1-BA204XRXXXXXZAZZ204BXXX

2) The DO-160D environmental categories breakdown is detailed in Table 1.

CATEGORY SECTION DESCRIPTION

C1 4.0 Temperature/Altitude

- 4.5.4 In-Flight Loss of Cooling

B 5.0 Temperature Variation

A 6.0 Humidity

204 7.0/8.0 Operational Shock and Crash Safety/Vibration

X 9.0 Explosion

R 10.0 Waterproofness

X 11.0 Fluids Susceptibility

X 12.0 Sand and Dust

X 13.0 Fungus

X 14.0 Salt Spray

X 15.0 Magnetic Effect

Z 16.0 Power Input

A 17.0 Voltage Spike

Z 18.0 Audio Frequency Susceptibility

Z 19.0 Induced Signal Susceptibility

204 20.0 Radio Frequency Susceptibility

B 21.0 Emission of RF Energy

X 22.0 Lightning

X 23.0 Lightning Direct Effects

X 24.0 Icing

Table 1 Environmental Categories Breakdown

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TASK 25-62-21-990-804

4. Frequency Allocations

SUBTASK 25-62-21-990-001

A.

Application1) This section addresses the 406.0-406.1 MHz transmitter window and the specific frequency band

allocations residing above 406.025 MHz, beginning with 406.028 MHz, which are assigned or reservedwithin the 406.0-406.1 MHz distress frequency window.

SUBTASK 25-62-21-990-002

B. Discussion

1) The 406 MHz transmitter frequency of the G406-4 ELT was originally 406.025 MHz. In order to complywith COSPAS-SARSAT frequency allocation requirements, changes to the 406 MHz frequency may occur

since the original release of this product.

2) While the original G406-4 ELTs covered by this manual transmit on 406.025 MHz, current G406-4 ELTsmay not. The product identification label on each ELT specifies the transmitting frequencies of theindividual ELT. The 406 MHz component may be 406.025, 406.028, 406.037 MHz, etc. Allocation offrequencies, based on beacon population per specified frequency band, is controlled by

COSPAS-SARSAT.

3) The frequency references throughout this manual for the 406 MHz component should be considered thebaseline and the specific frequency indicated on the ELT product label should be substituted if it differsfrom 406.025 MHz.

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TASK 25-62-21-990-805

5. List of Acronyms, Abbreviations, and Definitions

SUBTASK 25-62-21-990-001

Term Definition AC Advisory Circular – A Federal Aviation Administration (USA) bulletin with special

information. For the purposes of this document, the acronym AC does not refer toelectrical alternating current.

AWG American Wire Gauge – An electrical wire diameter standard. Look for this

acronym in front of or following a wire size number.

BNC Connector A very common type of coax cable connector having a 50 Ω impedance and usedfor RF signal connections.

CAR Canadian Aviation Regulations – The rules and regulations governing themanufacture, certification, operation, maintenance, and alteration of aircraft in

Canada.

CFR Code of Federal Regulations – The general and permanent rules published in the

Federal Register by the executive departments and agencies of the FederalGovernment. Title 14, “Aeronautics and Space” contains the FARs.

Container The term “Container”, within the context of this document, refers to a device

designed to suppress RF signals, such that the broadcast of an ELT placed in thecontainer cannot reach the SAR satellite system.

COSPAS-SARSAT The international search and rescue consortium that governs the internationalsatellite-based search and rescue distress alert detection and informationdistribution system. For a complete description go to the official web site for the

International COSPAS-SARSAT Program.

DER Designated Engineering Representative – An individual qualified and designatedby the FAA to approve, or recommend approval, of technical data to the FAA.

Drip Loop Extra wire length used to form a U-shaped bend in a wire or cable. Water or other

fluids will flow down to the bottom of the loop and drip off. Electrical connectionsare made at the top of the loop.

ELT Emergency Locator Transmitter – ELTs are installed on aircraft and used to send

emergency signals to the SAR satellite system. The word “Beacon” is associatedwith these devices.

EMI Electromagnetic Interference – An undesirable disturbance that affects an

electrical circuit due to either electromagnetic conduction or electromagneticradiation emitted from an external source. Also called radio frequency interference

or RFI.

Eurocae European Organization for Civil Aviation Equipment – EUROCAE documents arewidely referenced as a means of compliance to European Technical Standard

Orders (ETSOs) and other regulatory documents.

FAA Federal Aviation Administration – The United States government agency for

aircraft safety and regulation.

FAR Federal Aviation Regulations – The rules and regulations governing themanufacture, certification, operation, maintenance, repair, and alteration of

aircraft in the United States.

Form 337 FAA Form 337 is required anytime a major repair and/or major alteration is

performed on an aircraft. Refer to FAR, Part 43, Appendix A and the definitions ofMajor Repair/Alteration contained in FAR, Part 1 for guidance.

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FSDO Flight Standards District Office – FAA district offices responsible for aircraftcertification, operation, maintenance, and modification issues, approvals andenforcement.

G-Switch A velocity switch that detects sudden de-acceleration and is used to automaticallyactivate an ELT. May also be referred to as a “crash sensor”.

LED Light Emitting Diode – Semiconductor device that emits light when current ispassed through it. Usually used as a status or warning indicator.

MIL The three-letter acronym that stands for “Military” and proceeds militaryspecifications and standards numbers (e.g., MIL-W-xxxx would indicate a wirespecification and MIL-STD-xxxx would indicate a standard).

P/N Part Number – Refers to an ACR Electronics part number, unless otherwise noted.Part numbers are also indicated with parentheses (e.g., XXX-XXXX).

Plug The term “Plug”, within the context of this document, refers to the male half of anelectrical connector.

Receptacle The term “Receptacle”, within the context of this document, refers to the female

half of an electrical connector.

RF Radio Frequency – The range of electromagnetic radiation that constitutes the

radio spectrum and corresponds to the frequency of alternating current electricalsignals used to produce and detect radio waves.

RTCA Radio Technical Commission for Aeronautics – Organization that makesrecommendations for airworthiness. Refer to http://www.rtca.org/aboutrtca.aspfor more information.

RTV A rubbery silicon-based adhesive typically used to prevent vibration problems andwater intrusion.

SAR Search and Rescue

Screen Room The term “Screen Room”, within the context of this document, refers to a roomdesigned to suppress RF signals, such that the broadcast of an ELT placed in the

screen room cannot reach the SAR satellite system.

Service Loop A length of wire or cable, at the connection point, of sufficient length to allow acomponent to be withdrawn from its mounting position and disconnected from itsassociated wiring.

Tether A tether is a cord or similar device that anchors something movable to a stationarypoint or anchors two items together, such that they cannot become separatedbeyond the length of the tether.

TNC Connector A threaded version of a BNC connector.

TPS Connector A small, rugged, three-pin bayonet locking connector designed for use when space

and weight limitations are of primary concern.

TSO Technical Standard Order – A TSO is a minimum performance standard issued bythe FAA for specified materials, parts, processes, and appliances used on civil

aircraft.

UTC Coordinated Universal Time – A time standard based on International Atomic

Time. UTC is the time system used in aviation and is often associated withGreenwich Mean Time (GMT) and/or “Zulu” time.

VHF Very High Frequency – The 30 MHz to 300 MHz radio frequency band.

VSWR Voltage Standing Wave Ratio – Electrical signals will “echo” back on a wire if loadimpedance is not matched to the impedance of the wire. VSWR is a measurement

of the amount of voltage being “echoed,” compared to the original signal.

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TASK 25-62-21-990-806

6. References

SUBTASK 25-62-21-990-001

A.

Regulatory Documents1) The following regulatory documents are referred to herein. When referring to such documents, it is the

manual user’s responsibility to ensure they are using the latest revision or release of such documents. Tothat end, the revision designator of specific document numbers has not been included, with theexception of the RTCA document listing, which reflects the revision level of the documents at the time

of TSO testing and certification.

2) Except in the case of a printed manual, reference documents available on-line or source locations are

linked to applicable web sites.

3) United States

a) AC 43-9, “Maintenance Records”

b) AC 43-210, “Standardized Procedures for Requesting Field Approval of Data, Major Alterations, andRepairs”

c)

AC 43.9-1, “Instructions for Completion of FAA Form 337”

d) AC 43-13-1, “Acceptable Methods, Techniques, and Practices – Aircraft Inspection and Repair”

e) AC 43.13-2, “Acceptable Methods, Techniques, and Practices - Aircraft Alterations”

f) FAR, Part 43, “Maintenance, Preventive Maintenance, Rebuilding, and Alteration”

g) FAR, Part 91, “General Operating and Flight Rules”

4) Canada

a) CAR, Part V, “Airworthiness”

b) CAR, Part VI, “General Operating and Flight Rules”

5) COSPAS-SARSAT

a) C/S G.005, “Cospas-Sarsat Guidelines on 406 MHz Beacon Coding, Registration and Type Approval”

b)

C/S S.007, “Handbook of Beacon Regulations”

6) RTCA – The following documents are available for purchase at RTCA’s web site www.rtca.org, or bymail:

a) DO-160D, “Environmental Conditions and Test Procedures for Airborne Equipment”

b) DO-178B, “Software Considerations in Airborne Systems and Equipment Certification”

c) DO-182, “Emergency Locator Transmitter (ELT) Equipment Installation and Performance”

d) DO-183, “Minimal Operational Performance Standards for Emergency Locator Transmitters -

Automatic Fixed-ELT (AF), Automatic Portable-ELT (AP), Automatic Deployable-ELT (AD),Survival-ELT (S) Operating on 121.5 and 243.0 MHz”

e) DO-204, “Minimal Operational Performance Standards for 406 MHz Emergency LocatorTransmitters (ELT)”

SUBTASK 25-62-21-990-002

B. Other Documents

1) The following documents are available on-line at the Artex products web site atwww.acrelectronics.com, or from ACR Electronics upon request.

a) 570-1000, “ELT Test Set (ETS) Operation Manual”

b) 570-4602, “ELT/NAV Interface Description, Operation, Installation and Maintenance Manual”

http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/CFB1221D9B8038B9862569C40075C77F?OpenDocumenthttp://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/31bed1c77a32c64886256e43006da997/$FILE/AC43-210.pdfhttp://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/cfb1221d9b8038b9862569c40075c77f/$FILE/AC43-9C.pdfhttp://www.artex.net/support-resources/documents.phphttp://www.artex.net/support-resources/documents.phphttp://www.artex.net/support-resources/documents.phphttp://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/cfb1221d9b8038b9862569c40075c77f/$FILE/AC43-9C.pdfhttp://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/31bed1c77a32c64886256e43006da997/$FILE/AC43-210.pdfhttp://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/CFB1221D9B8038B9862569C40075C77F?OpenDocument

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DESCRIPTION AND OPERATION

TASK 25-62-21-870-801

1. Description

SUBTASK 25-62-21-870-001

A. Functional Overview

1) The ELT automatically activates during a crash and transmits the standard sweep tone on 121.5 and243.0 MHz. Approximately every 50 seconds, for up to 520 milliseconds (long message protocol), the406 MHz transmitter turns on. During that time, an encoded digital message is sent to theCOSPAS-SARSAT Search and Rescue (SAR) satellite system.

2) The information contained in the message includes:

a) Serial number assigned to the ELT by the beacon manufacturer or the national beacon registrationauthority, or

b) Aircraft identification or registration number, and

c)

Country of registration and country code; plus

d) Position coordinates, when coupled with an ELT/NAV Interface (453-6500). Refer to the ELT/NAVInterface Abbreviated Component Maintenance Manual (570-4602) for a detailed discussion of theinteraction between the ELT, ELT/NAV Interface, and aircraft navigation system.

3) The 406 MHz transmitter will operate for 24 hours and then shuts down automatically. The 121.5/243.0transmitter will continue to operate until the batteries are exhausted, which is at least 50 hours.

4) The 406 MHz transmitter produces a much more accurate position, typically 3 kilometers as comparedwith 15 to 20 kilometers for 121.5/243.0 MHz transmitters. When coupled to the aircraft navigationsystem via the ELT/NAV Interface, the accuracy improves to approximately 100 meters.

5) The ELT transmits a digital message that allows search and rescue authorities to contact theowner/operator of the aircraft through information contained in a database. Information contained in

the database includes:a) Type of aircraft and aircraft registration number,

b) Owner address and telephone number, and

c) Alternate emergency contact.

6) After the ELT is activated and the 406 MHz signal is detected by the SAR satellite system and a positionis calculated, the 121.5/243.0 MHz transmissions are used to home in on the crash site.

NOTE: Effective February 1, 2009, COSPAS-SARSAT has terminated satellite processing ofdistress signals from 121.5 and 243.0 MHz beacons.

7) Aircraft communications transceivers are not capable of receiving 406 MHz transmissions; therefore, theonly methods of monitoring the ELT are:

a) The blinking cockpit remote switch LED,

b)

The buzzer, orc) 121.5/243.0 MHz transmissions, which can be monitored using the aircraft communications

transceiver or an AM radio tuned to 121.5 MHz.

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SUBTASK 25-62-21-870-002

B. Components

1) The G406-4 ELT main assembly is housed in a high impact, fire resistant, polycarbonate plastic case,which is enclosed in a protective mounting frame assembly made of similar material. See Figure 1

G406-4 ELT and Mounting Frame Assembly.

NOTE: The ELT main assembly and its mounting frame assembly are capable of withstandingextremely harsh environments and have been subjected to the rigorous environmentaltesting required by COSPAS-SARSAT for certification.

Figure 1 G406-4 ELT and Mounting Frame Assembly

2) The cockpit-mounted remote switch assembly is comprised of an ELT status LED and control switch andallows an operator to manually turn the ELT on (i.e., activate) for testing and reset (i.e., deactivate) the ELT.See Figure 2 Remote Switch Front View.

NOTE: The ELT CANNOT be disarmed or disabled from the cockpit. Cockpit operation is limitedto deactivating or manually activating the ELT.

Figure 2 Remote Switch Front View

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3) The buzzer (i.e., horn) provides an audible alert when the ELT is active. See Figure 3 Buzzer.

Figure 3 Buzzer

4) The battery pack for the G406-4 ELT consists of four “D” size lithium manganese dioxide cells connected in

series. In an effort to increase the safety of the battery pack, a number of features were designed into thebattery pack. To prevent the cells from being charged, diodes are connected across each cell and fuses areconnected to the output. See Figure 4 Battery Pack Assembly.

Figure 4 Battery Pack Assembly5) The principal antennas designed for use with the G406-4 ELT include a dual input rod antenna and separate

121.5/243.0 MHz and 406 MHz single input whip antennas. Selection of the dual input rod antenna or theseparate whip antenna combination is dependent upon end use, aircraft configuration and speed, and otherfactors. See Figure 5 Antennas.

Figure 5 Antennas

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TASK 25-62-21-870-802

2. Operation

SUBTASK 25-62-21-870-001

A.

Operational Overview1) See Figure 6 ELT Operational Flow Diagram.

2) A primary feature of the G406-4 ELT is its simplicity of operation. As long as the ELT is connected to theremote switch harness ELT connector, such that pins 5 and 8 are jumpered (G-switch loop), it will

activate in the event of a crash.

NOTE: Neither the cockpit remote switch or the ELT local switch can be positioned in such amanner as to prevent automatic activation when the ELT is connected properly.

Figure 6 ELT Operational Flow Diagram

3) ELT operation is designed to prevent human error and misuse in regards to automatic activation. TheELT cannot be activated by dropping, rough handling or during shipping.

4) When the ELT is activated, the presence of the emergency sweep tone and the flashing cockpit remote

switch panel LED indicates an active, normal functioning ELT. The cockpit panel LED must immediately

begin to flash continuously upon ELT activation.5) The ELT is considered to be either “ACTIVE” or “INACTIVE”. When “INACTIVE”, the ELT is in a state of

rest and performs no functions. Taking the ELT from the “INACTIVE” state to the “ACTIVE” staterequires a positive switch transition from either the cockpit remote switch, ELT local switch, or G-switch.

a) It is possible the G-switch could activate the ELT as the result of severe maneuvers or a very hardlanding.

b) To take the ELT from an “ACTIVE” state back to an “INACTIVE” state, a “RESET” must occur. SeeSUBTASK 25-62-21-870-004 on page 22.

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6) A warning buzzer is required under C126 TSO approval. The buzzer is powered by the ELT and thereforenot dependent upon the aircraft battery for operation. It is not designed to operate continuously, butsounds at predetermined intervals and runs for shorter periods toward the end of ELT battery life.

SUBTASK 25-62-21-870-002

B.

Normal Operation1) The cockpit remote switch is in the “ARM” position (i.e., down).

2) The local switch on the ELT is in the “OFF” position (i.e., down).

SUBTASK 25-62-21-870-003

C. Manual Activation

1) The ELT may be manually activated by placing either the remote switch or the ELT local switch in the “ON” position.

NOTE: As long as the cockpit remote switch and the ELT local switch are in the ARM/OFFpositions respectively, the ELT will automatically activate on impact.

SUBTASK 25-62-21-870-004

D. ELT Reset

1) If the ELT is activated accidently, it will need to be reset.

2) Reset the ELT from the cockpit by moving the remote switch to the “ON” position, waiting approximately

one second, and then moving it back to the “ARM” position. If the switch is already in the “ON” position,move it to the “ARM” position.

3) Reset the ELT locally by moving the switch on the ELT to the “ON” position, waiting approximately onesecond, and then moving it back to the “OFF” position. If the switch is already in the “ON” position, moveit to the “OFF” position.

NOTE: The ELT cannot be reset if either the cockpit remote switch or the ELT local switch is inthe “ON” position.

SUBTASK 25-62-21-750-001

E. Functional Check

1) A monthly functional check is recommended to verify operational status of the ELT.

2) Perform this functional check in accordance with SUBTASK 25-62-21-750-011 on page 34.

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TASK 25-62-21-870-803

3. Specifications

SUBTASK 25-62-21-870-001

A.

Environmental and Physical1) Table 2 lists the environmental and physical specifications of the G406-4 ELT.

NOTE: For automatic activation, the higher threshold of 4.5 ft/sec (2.3 g ) is specified inaccordance with Eurocae ED-62. Use of the higher threshold crash sensor has beenapproved by the FAA as a deviation to TSO C126 (FAA Reference #98-130S-108,February 6, 1998).

CRITERIA PARAMETER CHARACTERISTIC

TemperatureStorage -55° C to +85° C

Operating -20° C to +55° C

Mechanical

Vibration 10 g , 5 Hz to 2,000 Hz

Shock 500 g for 4 ms

Crashworthiness 100 g for 23 ms

Humidity 95% for 50 hours

Penetration 55 lbs from 6 in. (25 kg from 15 cm)

Crush 1,000 lbs (454 kg)

Altitude 55,000 ft (16,764 m)

Automatic Activation G-Switch 4.5 ±0.5 ft/sec (2.3 g )

WeightELT Complete w/Battery Pack,

Mounting Tray, and Covers4.25 lbs (1.9 kg)

Dimensions (LxHxW)ELT Complete w/Battery Pack,

Mounting Tray, and Covers11.63 x 3.90 x 3.76 in.(295 x 99 x 96 mm)

Software In accordance with RTCA/DO-178B, Level D

Table 2 Environmental and Physical Specifications

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SUBTASK 25-62-21-870-002

B. Electrical

1) Table 3 lists the electrical specifications of the G406-4 ELT.

CRITERIA PARAMETER CHARACTERISTIC

Operating Frequencies

406.025 MHz

± 2 KHz (Initial)

± 5 KHz (5 years)2 parts/10E9 in 100 ms

406.028 MHz, or higher ± 1 KHz

121.5 and 243.0 MHz ± 0.005%

Modulation

406 MHz Bi-Phase L (G1D)

121.5 and 243.0 MHz Amplitude Modulation (A3X)

Transmitter Duty Cycle

406 MHz440 ms (± 1%), or

520 ms (± 1%), every50 seconds (± 5%)

121.5 and 243.0 MHz Continuous

Peak Effective RadiatedPower (PERP)

406 MHz5 W (37 ± 2 dB) PERP, or

EIRP for 24 hrs @ -20° to +55° C

121.5 and 243.0 MHzMin. 50 mW (17 dBm) PERP for 50 hrs@ -20° to +55° C or 100 mW EIRP (20

dBm) for 48 hrs @ -20° to +55° C

Occupied Bandwidth406 MHz 20 KHz max.

121.5 and 243.0 MHz 25 KHz max.

Spurious Emissions

406 MHz Per RTCA/DO-204

121.5 and 243.0 MHz Per CFR Title 47 (FCC), Part 87

Battery

Type of Cell Lithium Manganese Dioxide

Voltage 12.0

Amp-Hour Rating 10.0

Table 3 Electrical Specifications

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SUBTASK 25-62-21-870-003

C. Antennas

1) Table 4 lists the specifications of the antennas approved for use with the G406-4 ELT.

PARAMETERS

CHARACTERISTIC

110-320 110-324 110-329

Style Rod Whip Whip

Frequencies121.5, 243.0

and 406 MHz121.5 and 243.0 MHz 406 MHz

VSWR121.5 and 243.0 MHz -

2.0:1 Max.406 MHz - 1.5:1 Max.

2.0:1 Max. Less than 1.5:1

Polarization Vertical Monopole

Radiation Pattern

121.5/243 MHz -

Omnidirectional406 MHz - Hemispherical

Omnidirectional Hemispherical

Impedance (ohms) 50 Nominal

Weight0.45 lbs(0.20 kg)

0.16 lbs(0.07 kg)

0.16 lbs(0.07 kg)

Drag2.90 lbs (1.3 kg) @ 350

KTS, 25,000 ftNegligible Negligible

Coax Cable RG-142

ConnectorsBNC Female

(121.5/243.0 MHz)TNC Female (406 MHz)

BNC Female TNC Female

Dimensions

(Base-to-Tip)

15.50 in.

(39.4 cm)

17.40 in.

(44.2 cm)

7.10 in.

(18.0 cm)

Table 4 Antenna Specifications

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TEST AND FAULT ISOLATION

TASK 25-62-21-750-801

1. Inspection and Test Regulatory Requirements

SUBTASK 25-62-21-990-001

A. United States

1) In accordance with FAR Part 91, Subpart C, § 91.207 (d), the ELT must be inspected within 12 calendarmonths after the last inspection for:

a) Proper installation;

b) Battery corrosion;

c) Operation of controls and crash sensor; and

d) The presence of a sufficient signal radiated from its antenna.

2) All maintenance shall be performed in accordance with FAR Part 43, Appendix D, which requires thefollowing inspections at each annual or 100-hour inspection:

a) ELT and mount for improper installation;

b) Wiring and conduits for improper routing, insecure mounting, and obvious defects;

c) Bonding and shielding for improper installation and poor condition; and

d) Antenna, including trailing antenna, for poor condition, insecure mounting, and improper operation.

SUBTASK 25-62-21-990-002

B. Canada

1) CAR Part VI, Standard 625, Appendix C, requires the ELT to be inspected at intervals not exceeding 12months.

2) All maintenance and testing shall be performed in accordance with the requirements of CAR Part V,

Standard 571, Appendix G, which requires:a) Corrosion inspection;

b) Operational testing;

c) Performance testing, including:

1. Measured peak power after 3 minutes of operation,

2. Measured frequency after 3 minutes of operation,

3. Audio modulation, which shall be recognizable as a typical ELT signal,

4. Measured current draw in the “OFF” (ARM) and in the “ON” position, as specified by themanufacturer, and

5. The automatic activation system.

SUBTASK 25-62-21-990-003

C. Other Countries

1) For all other countries, maintenance and testing shall be conducted in accordance with the requirements

of applicable national regulatory authorities and the requirements herein, as applicable. Localregulations and requirements shall take precedence.

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TASK 25-62-21-750-802

2. Inspection and Test Procedures

SUBTASK 25-62-21-990-001

A.

Checklist1) Table 5 provides a list of the ELT inspection and testing requirements, a copy of which may be used as

a checklist to verify inspection and test completion. The item numbers in the table correspond to theitem identifiers for each task.

NOTE: Items 5a through 5h are mandatory requirements only in Canada, in addition tomeeting the other inspection and test requirements listed in Table 5.

ITEM NO. DESCRIPTION BY

1 Coax Cable and Wiring Connections Inspection

2 ELT Mounting Tray and Hardware Inspection

3 ELT Battery Pack Inspection

4 G-Switch Functional Check

5a 121.5 MHz Frequency Measurement

5b Audio Modulation Check

5c 121.5/243.0 MHz Power Output Measurement

5d 406 MHz Frequency Measurement

5e 406 MHz Power Output Measurement

5f Current Draw Test

5g Digital Message Verification

5h ELT Reset Check

6 Installed Transmitter Test

7 Antenna Test

8 Inspection and Test Documentation

Table 5 ELT Inspection and Test Checklist

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SUBTASK 25-62-21-000-001

B. Preparation

1) Remove the ELT in accordance with SUBTASK 25-62-21-010-001 on page 39.

2) Remove the battery pack in accordance with SUBTASK 25-62-21-050-001 on page 40.

SUBTASK 25-62-21-220-001

C. Coax Cables and Wiring Connections Inspection – Item 1

1) Check remote switch harness connector for corrosion bent or broken pins and other damage.

2) Check antenna coax cable connectors for corrosion, bent or broken center conductor, and otherdamage.

NOTE: Pay special attention to the center conductor, which is prone to retracting into theconnector housing.

SUBTASK 25-62-21-220-002

D. Mounting Tray and Hardware Inspection – Item 2

1)

Inspect mounting tray for cleanliness, cracks, and other damage.

2) Check mounting tray hardware for corrosion and security.

SUBTASK 25-62-21-220-003

E. Battery Pack Inspection – Item 3

CAUTION: THE BATTERY PACK CONTAINS ELECTROSTATIC DISCHARGE SENSITIVE (ESD)

COMPONENTS AND, AS SUCH, IT MUST BE HANDLED WITH CARE. IF POSSIBLE, WEAR A GROUNDED WRIST STRAP WHEN HANDLING THE BATTERY PACK DURINGINSPECTION AND MAINTENANCE ACTIVITIES. TAKE PARTICULAR CARE TO AVOID

TOUCHING THE EXPOSED CIRCUIT BOARD AND CONNECTOR PINS ON THE BOARD.CAUTION: DO NOT USE CONTACT CLEANER ON ELT COMPONENTS. SUCH CHEMICAL AGENTS

CAN BE HIGHLY DESTRUCTIVE TO THE MOUNTING HARDWARE AND ELT HOUSING,CAUSING CRACKING, FRACTURING AND OTHER DAMAGE.

1) Check battery cells, components, and connectors for corrosion and other damage.

2) Check wiring for breaks, damaged insulation, and improper or damaged connections.

3) Check housing for cracks and other visual damage.

4) Remove any corrosion residue from the underside of the ELT.

5) Check the battery pack expiration date.

6) Replace the battery pack if any of the following conditions are true:

a) After use in an emergency;

b) After an inadvertent activation of unknown duration;

c) When the total of all known transmissions exceeds one hour; or

d)

On or before battery replacement (expiration) date.

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SUBTASK 25-62-21-750-001

F. G-Switch Functional Check – Item 4

CAUTION: A JUMPER IS REQUIRED TO PERFORM THIS CHECK. DUE TO THE POTENTIAL OFPHYSICAL DAMAGE IF THE JUMPER IS IMPROPERLY INSTALLED, THIS STEP SHOULD

ONLY BE PERFORMED BY AN EXPERIENCED TECHNICIAN/MECHANIC.

1)

Reinstall the battery in accordance with SUBTASK 25-62-21-450-001 on page 58.

NOTE: If tests 5a through 5h are going to be performed, the battery may be temporarilyinstalled with only two screws, located on a diagonal from each other.

2) Perform this functional check within the first 5 minutes after the hour (UTC), as required by AC 43.13-1,

Chapter 12, § 12-22, Note 3.

3) Notify any nearby control tower of your intentions.

4) Install the 151-2012 test plug (receptacle) on the ELT plug or jumper ELT plug Pins 5 and 8.

NOTE: The ELT cannot be activated using this procedure unless Pins 5 and 8 on the ELT plug

are jumpered. See Figure 19 Remote Switch Harness Wiring Diagram on page 53.

5) Verify the ELT switch is in the “OFF” position.

6)

Monitor 121.5 MHz on an AM receiver.7) Activate the ELT by using a rapid forward (i.e., throwing) motion in the direction of the arrow on the ELT

label, followed by a rapid reversing action.

8) Verify activation by listening for the aural sweep tone on the receiver.

9) Reset the ELT by toggling the control switch to the “ON” position and then back to the “OFF” position.

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SUBTASK 25-62-21-750-002

G. Performance Testing Setup

NOTE: The ELT software routine logs battery life in 30-second increments. A minimum of 30seconds is added to the battery usage total each time the ELT is activated and

de-activated. If the ELT is left activated beyond the first 30 seconds, additional time is

added in 30-second increments.NOTE: Careful planning of the performance tests is necessary to avoid activating the ELT more

than necessary. Plan the performance testing in a manner that allows tests to be runconcurrently and test equipment settings to be quickly switched from one test toanother. By doing so, the three-minute warm-up requirement can be eliminated from anumber of tests and battery run time minimized to a large extent.

1) Place the ELT in a container or screen room capable of substantially attenuating RF signals, or thetransmitter power output shall be connected to a suitable dummy load to minimize radiation.

2) Use the ELT’s own battery pack as the power source for these measurements. An alternate powersource can be used where lengthy servicing, other than the performance tests, is anticipated.

3) Ensure that adequate attenuation rated for 406 MHz is installed between the ELT antenna output andthe measurement equipment to prevent damaging input circuitry, if required. At a minimum, the

attenuator should be rated at 30 dB, and 5 watts for a ½-second duration as shown in Figure 7Performance Testing Equipment Setup.

Figure 7 Performance Testing Equipment Setup

SUBTASK 25-62-21-750-003

H. 121.5 MHz Frequency Measurement – Item 5a

1) Connect the measuring device, referring to SUBTASK 25-62-21-750-002.

2) Activate the ELT by placing the control switch in the “ON” position.

3) Wait three minutes.

4) Perform Error! Reference source not found. during the three-minute waiting period.

5) Measure the frequency after the three-minute waiting period. The frequency must be within the

tolerance specified in Table 3 on page 24.

NOTE: If the 121.5 MHz carrier frequency is within specified tolerance, the 243.0 MHzfrequency will also be within tolerance.

SUBTASK 25-62-21-750-004

I. Audio Modulation Check – Item 5b

1) Perform this check in conjunction with SUBTASK 25-62-21-750-003.

2) Monitor 121.5 MHz on an AM receiver.

3) Listen for the aural sweep tone on the receiver. The audio should “sound” like an ELT.

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SUBTASK 25-62-21-750-005

J. 121.5/243.0 MHz Power Output Measurement – Item 5c

1) Connect the measuring device, referring to SUBTASK 25-62-21-750-002 on page 30.

2) Activate the ELT, if necessary, by placing the control switch in the “ON” position.

3)

Wait three minutes.4) Read the displayed amplitude for 121.5 MHz. The amplitude must be within the minimum specified for

121.5 MHz in Table 3 on page 24 at the terminal output.

5) Change to 243.0 MHz and repeat the procedure for 243.0 MHz.

SUBTASK 25-62-21-750-006

K. 406 MHz Frequency Measurement – Item 5d

CAUTION: POWER OUTPUT IS APPROXIMATELY 37 DB (5 WATTS). BE SURE ADEQUATE ATTENUATION IS INSERTED IN-LINE BETWEEN THE ELT ANTENNA OUTPUT AND THE

MEASURING DEVICE TO PROTECT THE INPUT CIRCUITS OF THE MEASURING DEVICE.

1) Connect the measuring device, referring to SUBTASK 25-62-21-750-002 on page 30.

2)

Activate the ELT, if necessary, by placing the control switch in the “ON” position.3) Wait three minutes.

4) Measure the frequency. Measure the frequency after the three-minute waiting period. The frequencymust be within the tolerance specified in Table 3 on page 24.

NOTE: The exact 406 MHz frequency used is printed on the ELT product label.

SUBTASK 25-62-21-750-007

L. 406 MHz Power Output Measurement – Item 5e

CAUTION: POWER OUTPUT IS APPROXIMATELY 37 DB (5 WATTS). BE SURE ADEQUATE ATTENUATION IS INSERTED IN-LINE BETWEEN THE ELT ANTENNA OUTPUT AND THEMEASURING DEVICE TO PROTECT THE INPUT CIRCUITS OF THE MEASURING DEVICE.

1)

Connect the measuring device, referring to SUBTASK 25-62-21-750-002 on page 30.

2) Activate the ELT, if necessary, by placing the control switch in the “ON” position.

3) Wait three minutes.

4) Read the displayed amplitude of the 406 MHz burst that follows the three-minute wait period. Theamplitude must be within the minimum specified for 406 MHz in Table 3 on page 24 at the output

terminal.

5) Deactivate the ELT by placing the control switch in the “OFF” position.

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SUBTASK 25-62-21-750-008

M. Current Draw Test – Item 5f

CAUTION: EXERCISE EXTREME CAUTION TO AVOID CAUSING A SHORT CIRCUIT CONDITION,WHICH WILL BLOW THE FUSES IN THE BATTERY PACK. THIS TEST SHOULD ONLY BE

PERFORMED BY AN EXPERIENCED TECHNICIAN/MECHANIC.

CAUTION: ALL “ON” STATE CURRENT MEASUREMENTS MUST BE MADE WITH THE RF OUTPUT(I.E., ELT ANTENNA CONNECTOR) LOADED WITH 50 OHMS RATED FOR 5 WATTS.EITHER A RESISTIVE LOAD OR EQUIPMENT WITH 50 OHM IMPEDANCE PADDEDWITH 10 DB/5 WATT ATTENUATOR. REFER TO SUBTASK 25-62-21-750-002 ON PAGE30.

1) Verify the ELT control switch is in the “OFF” position.

2) Separate the battery pack from the ELT.

3) Disconnect the 2-wire ELT power connector.

4) Install test harness 611-0024, or equivalent, in the power circuit. See Figure 8 Current Draw Test Setup.

Figure 8 Current Draw Test Setup

5) Read the current draw on the ammeter. Measured current should be 0 µA (micro-amps), and must notbe more than 6 µA.

6) Verify the ammeter is set to accommodate a range of at least 3.5 amps.


8) Allow the ELT to stabilize for at least 30 seconds to avoid false readings.

9) Read the current draw on the ammeter. Steady state current draw must not exceed 200 mA.

10) Deactivate the ELT by placing the control switch in the “OFF” position.

11) Remove the test harness.

12) Reinstall the battery pack in accordance with SUBTASK 25-62-21-450-001 on page 58.

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SUBTASK 25-62-21-750-009

N. Digital Message Verification – Item 5g


2) Allow the ELT to transmit for 15 to 30 seconds, but not more than 40 seconds.

3)

Set the 453-1000 ELT Test Set (ETS) beacon reader to receive and decode the ELT digital message.Refer to the ETS operating manual (570-1000) for ETS operating instructions and additional details.

NOTE: A beacon reader equivalent to the ETS may be used, provided it is capable of receivingand decoding the 406 MHz digital message.

4) Deactivate the ELT and read the test message broadcast at “turn-off”. Message examples are shown in

Figure 9 Short and Long 406 MHz Message Examples.

a) The test message broadcast by the ELT at “turn-off” contains all the information in an actual distress

message, except there is a special digital prefix that informs COSPAS-SARSAT satellites to ignore themessage.

b) The left hand example in Figure 9 Short and Long 406 MHz Message Examples is an ELTprogrammed for “User Protocol ELT with Serial Number”, with a test Hex ID. The right hand exampleis an ELT programmed for “Standard Location Protocol ELT with Serial Number”.

c)

Actual messages will vary depending on the protocol and information programmed into the ELT.

d) If the ELT is programmed with a location (long message) protocol and disconnected from the

ELT/NAV Interface, the message will indicate “Position Invalid” in lieu of position data, as shown inthe right hand example in Figure 9 Short and Long 406 MHz Message Examples.

Figure 9 Short and Long 406 MHz Message Examples

5) Repeat the activation and deactivation cycle if the ETS fails to read the message on the initial try. The406 MHz oscillator may not be warmed up. If continued attempts to read the message fail, check forself-test error codes and refer to Table 6 on page 37.

SUBTASK 25-62-21-750-010

O. ELT Reset Check – Item 5h

1)

Place the ELT control switch in the “ON” position.2) Return the switch to the “OFF” position.

3) If the ELT is working properly, the LED will stay on for approximately 1 second and then turn off. If aseries of flashes are displayed, refer to Table 6 on page 37.

NOTE: A 5-flash error indication will occur if the ELT is programmed with a location protocol,since no navigation input data is present.

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SUBTASK 25-62-21-750-011

P. Installed Transmitter Test – Item 6

CAUTION: DO NOT ALLOW THE DURATION OF THIS TEST TO EXCEED 5 SECONDS. THE ELTWILL TRANSMIT A 406 MHZ SIGNAL AFTER THE ELT IS ACTIVATED FOR

APPROXIMATELY 47 SECONDS. THE COSPAS-SARSAT SATELLITE SYSTEM WILL

CONSIDER THE 406 MHZ TRANSMISSION TO BE A VALID DISTRESS SIGNAL.

1) Reinstall the ELT in accordance with SUBTASK 25-62-21-410-001 on page 56.

2) Perform the following functional check within the first 5 minutes after the hour (UTC), as required by AC43.13-1, Chapter 12, § 12-22, Note 3.

3) Notify any nearby control tower of your intentions.

4) Tune a receiver, usually the aircraft transceiver, to 121.5 MHz.

NOTE: An AM radio may be used to receive the signal.

5) Activate the ELT by placing the cockpit remote switch in the “ON” position. The LED will begin flashing

continuously.

6) Listen for 3 audible sweeps on the receiver, which takes about 1 second.

7)

Verify the buzzer sounds immediately upon activation.8) Return the cockpit remote switch to the “ARM” (OFF) position while paying close attention to LED

activity when the ELT enters the “ARM” condition. If the ELT is working properly, the LED will stay on for

approximately 1 second and then turn off.

NOTE: This test also completes the requirement to check ELT controls by verifying operation ofthe remote switch.

9) Refer to Table 6 on page 36 if the LED displays a series of error code flashes.

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SUBTASK 25-62-21-750-012

Q. Antenna Test – Item 7

CAUTION: DO NOT ALLOW THE DURATION OF THIS TEST TO EXCEED 5 SECONDS.

1) Tune a low quality AM receiver (i.e., radio) to 121.5 MHz.

NOTE: The aircraft transceiver is not recommended for this test, because it is too sensitive toverify the integrity of the antenna system and it may pick up a weak signal even if the

antenna is disconnected from the ELT. An AM radio provides a better level of confidencefor this test.

2) Place the radio approximately six inches from the antenna.

3) Activate the ELT by placing the cockpit remote switch in the “ON” position.

NOTE: Perform this test within the first five minutes after the hour UTC.

4) Listen for 3 audible sweeps on the radio, which takes about 1 second. An audible signal verifies energyis being transmitted by the antenna.

5) Reset the ELT by placing the cockpit remote switch in the “ARM” position.

SUBTASK 25-62-21-750-013

R. Inspection and Test Documentation – Item 8

1) Make an appropriate entry in the aircraft maintenance records (i.e., logbook), including the date the ELTinspection and testing was satisfactorily completed.

2) In addition to the requirements of Step 1, for aircraft operating under Canadian authority and following

satisfactory completion of performance testing, the date on which the test was performed shall bemarked on the ELT external casing in a legible and permanent manner.

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TASK 25-62-21-810-801

3. Fault Isolation

SUBTASK 25-62-21-810-001

A.

Self-Test Error Troubleshooting Guidelines1) Table 6 describes the ELT self-test LED error codes (i.e., flash codes), their probable causes, and

possible solutions. The 5-flash error is not present when the ELT is programmed with a serial userprotocol (short message).

NOTE: Upon activation, the LED will display a long single flash, which is normal. Any self-testerror codes will display following this initial flash. Do not confuse the initial flash with a1-flash error code. If there are multiple errors, there is a 0.5 to 1.0 second pause

between each error code.

CODE PROBABLE CAUSE POSSIBLE SOLUTION

1-Flash

Indicates a G-switch loop open (Pins 5 and 8)

Remote switch harness connector loose ordisconnected at ELT

Check connector and tighten as necessary

ELT connector pins bent or brokenCheck condition of connector pins and

repair or replace as necessary

Connector pins 5 and 8 jumper open(internal to remote switch harness

connector at ELT end)Repair open jumper

3-Flash

Indicates a 406 MHz transmission problem

Open or short condition on antenna outputor coax cable

Verify the coax cable/antenna is connected

and in good conditionPerform continuity check of center

conductor and shield

Check for a shorted cable

Check for intermittent connection in thecoax cable

Antenna or installation faulty

Check with a VSWR meter. Check antenna

for opens, shorts, or a resistive groundplane connection

Impedance presented by antennaLengthen or shorten antenna coax cable

length by 4 to 6 inches

Insufficient ground planeProvide ground plane at least 12 inches in

diameter

Upright metal structure obstructingantenna causing re-radiation

Stay at least 10-12 inches away fromupright metal structures

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CODE PROBABLE CAUSE POSSIBLE SOLUTION

3-Flash(cont.)

Low power output

Battery low

3A fuse on battery pack circuit board faulty

Improper programming Verify 406 MHz programming

Transmitter module faultyCannot be repaired in field - Return to

factory for servicing

5-Flash

Indicates there is no navigation position data present

Aircraft navigation system off Turn on navigation system

Faulty system interface wiring or

connections

Check wiring and connections for

continuity and security

No 453-6500 ELT/NAV Interface installed

Install 453-6500 ELT/NAV Interface

Reprogram to short message

7-Flash

Indicates a battery problem

Operating time is >1 hour

Replace battery pack

Electrical circuits faulty

Table 6 ELT Self-Test Error Codes Troubleshooting Guide

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SUBTASK 25-62-21-810-002

B. ELT Troubleshooting Guidelines

1) Table 7 provides ELT troubleshooting guidelines for installation and operational issues.

SYMPTOM PROBABLE CAUSE POSSIBLE SOLUTION

Remote switch LED always on(steady)

Improper wiring Verify wiring

Short circuit

Check for frayed insulation

Verify integrity of all crimp andsolder connections

ELT will not turn off

Battery too low to support 406

burst and causes circuit to reset

Remove battery pack to disable

ELT and replace battery pack

Turn off ELT using local switch - If ELT turns off:

Defective remote switch harnessreset circuit wiring

Check wiring continuity and repairas necessary

Defective remote switch Replace remote switch

If ELT does not turn off using local switch:

ELT defective

Remove battery pack to disable

ELT and return ELT to factory forservicing

Table 7 ELT Troubleshooting Guide

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REMOVAL

TASK 25-62-21-010-801

1. ELT

SUBTASK 25-62-21-010-001

A. ELT Removal

1) See Figure 10 ELT Removal Sequence.

Figure 10 ELT Removal Sequence

2) Loosen the mounting frame cap thumbscrews.

3) Slide the mounting frame cap back away from the ELT.

4) Lift the protective top cover up, away from the ELT and set it aside.

5) Disconnect the two antenna coax cables from the ELT.

6) Disconnect the harness receptacle from the ELT, if necessary.

NOTE: The receptacle may disconnect when the mounting frame cap is pulled back.

7) Lift the ELT up from the connector end.

NOTE: Careful use of a flat blade screwdriver as a lever will make this step easier.

8) Slide the ELT up and out, away from the mounting tray.

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ART